Compressor construction for refrigerating devices



COMPRESSOR CONSTRUCTION FOR REFRIGERATING DEVICES Feb; 26, 1929;

Original Filed Juiy s. 1925 Patented Feb. 26, 1929.

UNITED STATES 1,703,108 PATENT OFFICE.

RASMUS M. HVID, OF CHICAGO, ILLINOIS.

COMPRESSOR CONSTRUCTION FOR REFRIGERATING DEVICES.

Original application filed July 6, 1825, Serial No. 41,767. Divided and this application filed July 20, 1925.

Serial No. 44,776. 1

My invention relates to refrigerating de vices, and particularly to a novel compressor construction adapted for use in connectiontherewith. The subject matter of this application was first disclosed in my copending application, Serial No. 41,767, filed July 6th, 1925, of which this is a division.

An object of the construction here disclosed is to provide means for compressing the refrigerating gas in a self-contained refrigerating unit. In order to avoid many of the difliculties heretofore experienced, I have provided for balancing the forces acting on the compressors thereby avoiding vibration and noise. In the construction here disclosed, I have accomplished the desired result and have minimized the required space and construction costs. I am enabled to utilize three compressors, all mounted in the same horizontal plane and all connected to the same crank pin. Furthermore, in order to provide for the requisite oscillation of the compressor cylinders unusually large wearing surfaces are provided. I have also improved the mriunting of such cylinders and simplified the construction thereof.

The invention will be more readily understood by reference to the accompanying drawings, in which:

Fig. 1 is a fragmentary vertical sectional view through a refrigerating unit within one chamber of which the compressors are mounted.

Fig. 2 is a plan View of the compressors, one thereof being shown in section.

Fig. 3 is a sectional view on the line 33 of Fig. 1, and

Fig. 4 is a pressor.

In the drawings I have illustrated only a fragmentary portion of the refrigerating apparatus. The casing within which the compressors are mounted consists of a panshaped member having a bottom wall, 10, and side walls, 11, the upper edges of the said walls fitting into a groove in a member, 12. A division wall, 13, is suitably secured to the member, 12, and serves as a support for the cylinder casings or bonnets. These bonnets are preferably formed of cast metal and have apertured ears, 14, by means of which they are secured to the wall, 13. Each casing has a top wall, 15, an end wall, 16, and areuate side walls, 17 as best shown in Figs. 2 and 3. The bottom is open and bottom plan view of a comone side is partly open, as indicated at 18, in Fig. 2. The top wall, 15, is provided with parts, 19, that communicate with the space above the wall, 13, and other ports, 20, that communicate with a. passage, 21, indicated in dotted lines in Fig. 1, through which oil is supplied to the working parts.

The cylinder member, as best shown in Fig. 2, is in the form of a flat, circular disc, having side Walls, 22, that closely it the arcuate side walls, 17, and a cylinder opening, 23, extending radially of the disc. The body of metal may be hollowed out if desired, as indicated at 24. The cylinder is likewise provided with ports, 25, that register in proper sequence with the ports, 19, and oil entrance openings or ports, 26, that register with the ports, 20.

The cylinder disc is inserted from the open lower end of the casing and held in position with the port-containing walls in close contact, by means of the circular slide plate, 27, Fig. 1, against which the force of a spring, 28, is exerted. The spring is retained by means of the cupped plate, 29, the margins of which are engaged by the spring ring, 29*, held in a groove near the lower margin of the casing.

The hollow piston, 30, is in screw thread engagement with a connecting rod, 31, the free end of Which has a bearing member, 32, extending above and below the axis of the rod and, in case three compressors are employed, has an angular extent less than 120 degrees. Thus the bearing members are so proportioned that all thereof may be placed around the pin, 33, of a crank, 34, connected to a driven shaft, 35.

After being suitably positioned, the hearing members are secured in position by means of the rings, 36, 37, surrounding and above and below the center of the bearings. A disc, 38, and connecting rod, 39, also mounted on the crank pin, 33, complete the assembly. The connecting rod, 39, serves to operate an oil pump, 40, not specifically claimed herein.

The operation of the assembled compressors will be apparent. Due to the rotation of the shaft, 35, the crank pin will be caused to revolve and movement will be transmitted through the connecting rods, 31, to'the pistons which will be reciprocated in the usual manner. However, a certain oscillation of the pistons will be required, and this is pro- 2- 1,7os,ioa

vided for by the circular construction of the cylinder discs and the casings within which they are mounted. The gas to be compressed is Withdrawn from the space above the wall, 13, through the openings, 15, 19 and 25, and is discharged following the compression stroke of the piston through the openings, in the cylinder wall and 27 in the slide plate, into the chamber within Which the compressors are mounted. Ihe compression springs, 28, serve to retain-the top walls of the cylinder discs in close contact with the walls, 15, of the casings, and leakage of gas around the ports will be avoided.

Due to the large bearing area, the wear of the parts will be inconsequential, particularly in View of the ample lubrication provided. The parts may be quickly disman tled for repair or inspection if necessary.

By the use of a plurality of compressors, arranged in equally spaced relation, about the shaft center, the vibration that would otherwise occur is avoided. Furthermore, by mounting the pistons in the same plane, I economize space and simplify the crank shaft construction.

Obviously the construction is capable of some modification, and I do not wish to be limited except as indicated in the appended claims.

I claim:

1. In compressor construction, the combination of a crank and a piston connected thereto, a cylinder casing having a circular cavity open at the bottom, a circular cylinder member mounted in said cavity for oscillation, a plate in said open bottom, a spring engaging said plate for holding the cylinder in place, and means for supporting said spring.

2. In a refrigerating device, the combination of a driven shaft having a crank, a compressor piston connected to the crank, a rigid casing having an open bottom and provided with arcuate side walls, a circular member fitted for oscillation in said cavity, said member havingan opening providing a cylinder, said opening being formed radially of said member, and means including a sprin located in the open bottom of said casing for holding the said member in position.

3. In a compressor, the combination of a wall, a plurality of separate casings or bonnets rigidly secured to said wall, each of said casings having an open bottom and side,

a circular member fitted for oscillation within said casing, said member'eontaining. a radial opening acting as a cylinder, a friction plate bearing against the member, a spring for retaining the plate in contact with the member, a retaining plate for holding the spring in position, and means for retaining the retaining plate in position.

4. In combination, a Wall, a casing fixed thereto and having an arcuate recess open at the bottom and one side, a circular cylinder member'fitted in said recess, a friction plate, a spring and a retainer composing the open bottom of said recess and retaining said piston in position, and a spring ring for holding the retainer in position.

In testimony whereof I have aflixed my signature.

RASMUS M. HVID. 

